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At what temp is my 99 cadi dts considered to be overheating. It has gone as high as 120? Should I be concerned.

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The radiator cap regulates the water pressure inside the radiator. The reason the cap has various spring ratings is because the water is typically hotter than boiling point to match the requirement of the engine. Most engines operate best at above 100 degrees C, and this is why the water needs to be pressurized. Each engine's optimal temperature range may differ slightly from model to model, but most are fitted with a temperature gauge to allow the driver to judge for themselves if the vehicle is overheating.If your vehicle is operating above normal, then please check the following:
1) Radiator cap for fit and corrosion.2) Condition of radiator. Feel from top to bottom after running. If cold in one area, then this could indicate a blockage. (replace radiator)3) Remove and check thermostat. Place in a glass of hot water, and view its operation (should open). Place in cold glass of water and view (should close).4) Operation of radiator cooling fan.5) Addition of antifreeze. Antifreeze helps even out hot temperature within the engine and improves performance and running.6) Pressurize system and check for leaks.
If none of the above are issues, then remove temperature sensor and compare resistance to a new one at the same temperature. Replace if necessary.

Posted on Nov 03, 2012

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Posted on Jan 02, 2017

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SOURCE: 1999 sunfire overheating

try changing the thermostat

Posted on Jan 09, 2009

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it's funny to be reading about a similar situation i'm having. i also have a '97 crown vic, bought at a municipal auction.
of course, running the a/c should put more load on the engine and produce more heat. but not enough to be concerned about. if you car seems to be overheating, the thermostat could be to blame.
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where is the needle pointing on your gage? have you replaced the thermostat?

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On the fans, allow the car to heat up, a/c off, eventually the fans should come on, be sure that they do, and if so, no worries.

Worry if the fans come on and they do not cycle on and off.

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